"Avoided" categorized as a type of presupposition

while reading a Wiki page about pragmatics and presuppositions, I came upon this explanation:

Some further implicative predicates: […] X avoided Ving » X was expected to, or usually did, or
ought to V, etc.

I don’t understand how it presupposes the implication of "usually did".

If one says: "Tom avoided gaining weight." I could understand it presupposes Tom should have gained weight, ie. expected to gain weights. Yet, it seems to be a stretch to presuppose Tom usually gained weight.

Would someone please help explain? Thank you so much for helping!